Abstract
The brake system of series 681 EMUs is and electric instruction formula air brake system combined with regeneration brakes. With this system, the regenerative brake power is affected by changes in load. For example, during wheel-slide control at the time of a light load section or in rainy weather, because the regenerative brake power is affected by reduction in regeneration capability accompanied by rise in line voltage, and because the wheel-slide is controlled by a VVVF inverter, fixed regenerative brake power cannot necessarily be demonstrated. With the experiments described herein, the brake cylinder pressure was successfully increased by approximately 100kPa by improving the dummy signal as a means of controlling the wheel side through the regeneration brakes. Therefore, as with light load regeneration, the mean deceleration under wet conditions improved approximately 10%, achieving 4.2km/h/s.
